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“Paint Systems”. Paintable Substrates. Aluminum Galvanized Steel (HDG) Galvalume. Why Do We Paint?. Provide protection Add aesthetic appeal Promote corporate brand and increase recognition Decrease energy costs. What is Paint?.

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“Paint Systems”

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Paint systems l.jpg

“Paint Systems”


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Paintable Substrates

  • Aluminum

  • Galvanized Steel (HDG)

  • Galvalume


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Why Do We Paint?

  • Provide protection

  • Add aesthetic appeal

  • Promote corporate brand and increase recognition

  • Decrease energy costs


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What is Paint?

Definition: A mixture of a pigment, resin, solvent and additives reduced to a liquid or paste form, applied usually with a brush or roller, and used as a protective covering or coloring of a surface.


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The Pigments

  • Small solid particles added to a paint to enhance appearance by providing color and /or improve physical (functional) properties of a paint. Pigments are protected by the resin system and are UV reflective.

  • Ceramic Pigments

  • Earth Tone Pigments

  • Organic Pigments


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Best

Better

Good

Different Pigments OfferDifferent Performance Properties

Inorganic – Ceramic

Earth Tone

Organic


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Fluoropolymer (PVDF)

  • Siliconized Modified Polyester (SMP)

  • Polyester

  • Plastisol

Epoxy

  • Urethane

  • Acrylic

The Resin

The most important part of any paint system. The liquid glue of the paint system that surrounds and protects the pigment particles.


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Best

Better

Good

Different Resins Offer Different Performance Qualities

Fluoropolymer (PVDF)

Siliconized Modified Polyester (SMP)

Polyester


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The Solvent

This is the vehicle by which the pigment is transported to the metal surface. Actually evaporates during the curing/baking process to permit the formation of a paint film.

  • Mainly used as a thinner

  • Totally volatile, leaves the film when baked

Solvent


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The Additives

Any number of chemicals added to the paint, usually in small amounts to bring special effects to the paint.

  • Flow

  • Cure

  • Air entrapment

  • Waxes


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Functions of the Components


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Cross-Section of Paint


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How Coatings Fail


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How Coatings Fail

Polyester Urethane

Polyester Urethane


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How Coatings Fail

Carbon-Fluorine Bond Is One of the Strongest in the Universe.


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Polyester Paint Systems

  • A generic polymer coating with limited weathering performance.

  • Generally Using Organic Pigments.

    • End Uses:

      • Interior Applications

        • Home Appliances

        • Lighting Fixtures

        • Wall Panels


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Siliconized Modified Polyester (SMP) Paint Systems

  • A generic coating type that represents a wide range of topcoats used on prepainted metal in construction.

  • The silicon extends the service life of the base polymer and improves weathering.

  • Generally Using Organic and Ceramic Pigments.

    • End Uses:

      • Metal Building Components.

      • Agricultural and Corrugated panels.


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Polyvinylidene Fluoride (PVDF)

  • The resin, which is a fluoropolymer, that is used as the major vehicle (base resin) in the paint system.

  • Paint chemistry of 70% by weight of PVDF resin.

  • Exhibits superior

    • Color retention

    • Chalk resistance

    • Corrosion Resistance

    • Flexibility

    • Stain Resistance

    • Overall exterior durability


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PVDF vs. Other Coatings


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PVDF vs. Other Coatings


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Weathering Properties


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Physical Properties


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Chemical Properties


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What Causes Chalking?

  • Failure in the resin system causes chalking.

  • As the resin system breaks down, resin particles along with imbedded pigment particles lose adhesion and take on a white appearance.

  • Visual ratings are assigned according to ASTM D659.

  • Ratings ranges from 10 – 0, where 10 is best.


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Kynar

500®

Silicone

Polyester

Kynar

500®

Polyester

Acrylic

Kynar

500®

What Causes Color Fading?

  • Failure in the pigment system causes color fading.

  • Fading is caused when substances in the environment attack the pigment portion of the paint and cause the color to change.

  • Color fade is expressed in calculated “Delta E” values or NBS units which are measured and calculated according to ASTM D2244.

  • Values range from 0 – Infinity, where 0 is best (no color change).


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Chalk and Weather Resistance

  • These panels exposed at an independent test fence facility in Southern Florida clearly demonstrate the superior weatherability of PVDF.


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unexposed

exposed

10 yrs. exposure

15 yrs. exposure

17 yrs. exposure

Chalk and Weather Resistance

Polyester

Powder

Yellow

Kynar 500

Blue

Urethane

Blue

Kynar 500

Bronze

Acrylic

Bronze

Kynar 500

Yellow

exposed


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Chalk and Weather Resistance

Siliconized Modified Polyester

45˚ South

160 months

unexposed

exposed

Exposure Panels

Control

20 months

51 months

110 months

160 months


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Chalk and Weather Resistance

PVDF Based Coating

45˚ South

160 months

unexposed

exposed

Control

Exposure Panels

20 months

51 months

110 months

160 months


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